1218085870 has 24 divisors (see below), whose sum is σ = 2329120584. Its totient is φ = 458572416.

The previous prime is 1218085867. The next prime is 1218085879. The reversal of 1218085870 is 785808121.

1218085870 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218085879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207852 + ... + 213631.

It is an arithmetic number, because the mean of its divisors is an integer number (97046691).

Almost surely, 2^1218085870 is an apocalyptic number.

1218085870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218085870 is a deficient number, since it is larger than the sum of its proper divisors (1111034714).

1218085870 is a wasteful number, since it uses less digits than its factorization.

1218085870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421524 (or 421507 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 40.

The square root of 1218085870 is about 34901.0869458245. The cubic root of 1218085870 is about 1067.9706111838.

The spelling of 1218085870 in words is "one billion, two hundred eighteen million, eighty-five thousand, eight hundred seventy".